PATH

Integration of GPS/INS and Magnetic Markers for Advanced Vehicle Control

Farrell, Jay
Barth, Matthew
2001

This report describes the results of a project supported by California Partners for Advanced Transit and Highways (PATH). The main objective of the project was to develop and demonstrate a triple redundancy navigation system incorporating magnetometer, inertial, and carrier phase differential Global Positioning System (GPS) measurements.

Cooperative Adaptive Cruise Control (CACC) For Partially Automated Truck Platooning:Final Report

Shladover, Steven
Lu, Xiao-Yun
Yang, Shiyan
Ramezani, Hani
Spring, John
Nowakowski, Christopher
Nelson, David
2018

Cooperative Adaptive Cruise Control (CACC) provides an intermediate step toward a longer-term vision of trucks operating in closely-coupled automated platoons on both long-haul and short-haul freight corridors. There are important distinctions between CACC and automated truck platooning. First, with CACC, only truck speed control will be automated, using V2V communication to supplement forward sensors. The drivers will still be responsible for actively steering the vehicle, lane keeping, and monitoring roadway and traffic conditions. Second, while truck platooning systems have relied on a...

Opportunities And Constraints For Advanced Highway Technologies: A Speculative Analysis

Deakin, Elizabeth
1989

Might the performance of transportation systems be significantly improved through greater application of emerging technologies? Recent advances in computers, materials, communications, control systems, information systems, and many other areas raise intriguing possibilities.

Development and Implementation of a Vehicle-Centered Fault Diagnostic and Management System for the Extended PATH-AHS Architecture: Part II

Yi, Jingang
Suryanarayanan, Shashikanth
Howell, Adam
Horowitz, Roberto
Tomizuka, Masayoshi
Hedrick, Karl
2002

This project is a continuation of MOU 373. It concludes ongoing research to extend and integrateexisting results on fault diagnostic and fault management research, and develop a comprehensivefault management system. Features include a multi-layer fault diagnostic and management system,diagnosis of faults in the sensors and actuators of the lateral and longitudinal control systems, detec-tion of faults in the most vital sensors and actuators, and development of a systematic methodologyfor processing diagnostic residues. Experimental implementation and testing of the completed sys-tem is...

Development of Requirement Specifications for Transit Frontal Collision Warning System

Wang, Xiqin
Lins, Joanne
Chan, Ching-Yao
Johnston, Scott
Zhou, Kun
Steinfeld, Aaron
Hanson, Matt
Zhang, Wei-Bin
2003

The U.S. Department of Transportation (US DOT) initiated the Intelligent Vehicle Initiative (IVI) Program with the goal of improving safety through the application of advanced technologies. The frontal collision warning function has been identified as one of the key safety improvement measures for the transit vehicle platform of the IVI Program. Frontal collision, defined as a bus colliding with a vehicle in front of the bus, is a frequent incident in transit bus operations and the cause of property damage, personal injuries, and interruption to bus operations. A team that includes San...

PEDAMACS: Power Efficient and Delay Aware Medium Access Protocol for Sensor Networks

Coleri, Sinem
Varaiya, Pravin
2004

We consider a class of sensor networks with two special characteristics. First, the nodes periodically generate data for transfer to a distinguished node called the access point. Second, the nodes are (transmit) power and energy limited, but the access point, which communicates with the ‘outside world’, is not so limited. Such networks might be used for instance when a geographically distributed physical process, such as traffic on a freeway or at an urban street intersection, is periodically sensed for purposes of process control. We propose a medium access control scheme, called PEDAMACS...

Testing and Evaluation of Robust Fault Detection and Identification for a Fault Tolerant Automated Highway System

Chen, Robert H.
Ng, Hok K.
Speyer, Jason L.
Mingori, D. Lewis
2002

This report concerns vehicle fault detection and identification. A vehicle health monitoring approach based on analytical redundancy is described. To detect and identify actuator and sensor faults, fault detection filters and parity equations are developed for the longitudinal dynamics of the PATH Buick LeSabre. Fault detection filters and parity equations use the control commands and sensor measurements to generate the residuals which have a unique static pattern in response to each fault. This allows the faults not only to be detected, but also identified. Fault detection filters and...

Development of Binocular Stereopsis for Vehicle Lateral Control, Longitudinal Control and Obstacle Detection

Malik, Jitendra
Kosecka, Jana
Taylor, Camillo J.
McLauchlan, Philip
1999

This nal report describes the application of computer vision techniques to the lateral and longitudinal control of an autonomous highway vehicle. In the part of the project we focused on an analysis of the vehicle's lateral dynamics and the design of an appropriate controller for lateral control and investigated various static feedback strategies where the measurements obtained from vision, namely o set from the centerline and angle between the road tangent and the orientation of the vehicle at some look-ahead distance, are directly used for control. The role of the look-ahead, its...

Deployment Paths of ATIS: Impact on Commercial Vehicle Operations, Private Sector Providers and the Public Sector

Regan, Amelia C.
Golob, Thomas F.
2022

Most studies of the economic benefits of Advanced Traveler Information Systems (ATIS) have focused on the passenger transportation market. Few analyses have addressed the applications of ATIS to freight operations even though using ATIS to route or divert commercial vehicles can make a significant improvement in overall traffic flow and system performance. In this study, multivariate demand models were estimated based on large-scale surveys of commercial vehicle operators in California to determine the current use and perceptions of advanced information technologies, especially advanced...

Streamlining Connected Automated Vehicle Test Data Collection and Evaluation in the Hardware-in-the-Loop Environment

Fu, Zhe
Liu, Hao, PhD
Lu, Xiao-Yun, PhD
2020

Quality data collection, processing, and analysis are foundational to good research, policy making and regulation development. With the rapid development of Connected Automated Vehicles (CAV) technologies, it is urgent for both researchers and policy makers to obtain and evaluate good quality CAV data to better understand CAV impacts. CAV hardware-in-the-loop (HIL) tests can expedite CAV performance evaluation and system implementation. This research aims at equipping an existing HIL test tool with data management functions. To this end, a database instance on MySQL has been integrated...